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NEW QUESTION: 1
Sie haben eine Standardinstallation von SQL Server, die eine OLTP-Anwendung (Online Transaction Processing) hostet.
Benutzer berichten, dass sie insgesamt eine schlechte Abfrageleistung für die Anwendung feststellen.
Sie fragen die Wartestatistik ab und stellen fest, dass die beiden häufigsten Wartestatus CXPACKET und SOS_SCHEDULER_YIELD sind.
Sie müssen die SQL Server-Einstellungen ändern, um das Problem zu beheben, das die schlechte Abfrageleistung verursacht.
Welche beiden Einstellungen sollten Sie ändern? Jede richtige Antwort ist Teil der Lösung.
A. Mindestspeicher
B. Für Ad-hoc-Workloads optimieren
C. Maximaler Parallelitätsgrad (MAXDOP)
D. Erhöht die SQL Server-Priorität
E. Kostenschwelle für Parallelität
Answer: C,E
Explanation:
Explanation
A: Lower the MAXDOP.
When high CXPACKET values are encountered, a possible issue, even in case when parallelism is evenly distributed, is when the cost of creating the parallel plan is higher than the cost of the serialized thread. This is often something that is overlooked and by the rule of thumb of reaching for altering of the Max Degree of Parallelism (MAXDOP), by setting it to 1 (each and every query will be processed by the single CPU core).
Configuring MAXDOP settings to 1 should be the last resource used in troubleshooting excessive CXPACKET wait times.
When a high CXPACKET value is accompanied with a LATCH_XX and with PAGEIOLATCH_XX or SOS_SCHEDULER_YIELD, it is an indicator that slow/inefficient parallelism itself is the actual root cause of the performance issues. And in such a scenario if the LATCH_XX waits is ACCESS_METHODS_DATASET_PARENT or ACCESS_METHODS_SCAN_RANGE_GENERATOR class, then it is highly possible that the parallelism level is the bottleneck and the actual root cause of the query performance issue. This is a typical example when MAXDOP should be reduced.
E: The Cost Threshold for Parallelism (CTFP) value is in seconds and it means that for every query for which SQL Server estimates that running time will be longer than 5 seconds, a parallel plan will be created.
To prevent unwanted parallelism, the CTFP number could be increased and by the aforementioned rule of thumb, a minimum value of 25. Recent analysis indicates that 50 should be the optimal minimal number for modern computers.
References: https://www.sqlshack.com/troubleshooting-the-cxpacket-wait-type-in-sql-server/
NEW QUESTION: 2
A Lambda function reads metadata from an S3 object and stores the metadata in a DynamoDB table. The function is triggered whenever an object is stored within the S3 bucket.
How should the Lambda function be given access to the DynamoDB table?
Please select:
A. Create an 1AM service role with permissions to write to the DynamoDB table. Associate that role with the Lambda function.
B. Create a VPC endpoint for DynamoDB within a VPC. Configure the Lambda function to access resources in the VPC.
C. Create an 1AM user with permissions to write to the DynamoDB table. Store an access key for that user in the Lambda environment variables.
D. Create a resource policy that grants the Lambda function permissions to write to the DynamoDB table.
Attach the poll to the DynamoDB table.
Answer: A
Explanation:
Explanation
The ideal way is to create an 1AM role which has the required permissions and then associate it with the Lambda function The AWS Documentation additionally mentions the following Each Lambda function has an 1AM role (execution role) associated with it. You specify the 1AM role when you create your Lambda function. Permissions you grant to this role determine what AWS Lambda can do when it assumes the role. There are two types of permissions that you grant to the 1AM role:
If your Lambda function code accesses other AWS resources, such as to read an object from an S3 bucket or write logs to CloudWatch Logs, you need to grant permissions for relevant Amazon S3 and CloudWatch actions to the role.
If the event source is stream-based (Amazon Kinesis Data Streams and DynamoDB streams), AWS Lambda polls these streams on your behalf. AWS Lambda needs permissions to poll the stream and read new records on the stream so you need to grant the relevant permissions to this role.
Option A is invalid because the VPC endpoint allows access instances in a private subnet to access DynamoDB Option B is invalid because resources policies are present for resources such as S3 and KMS, but not AWS Lambda Option C is invalid because AWS Roles should be used and not 1AM Users For more information on the Lambda permission model, please visit the below URL:
https://docs.aws.amazon.com/lambda/latest/dg/intro-permission-model.html The correct answer is: Create an 1AM service role with permissions to write to the DynamoDB table.
Associate that role with the Lambda function.
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NEW QUESTION: 3
Refer to the exhibits.
Exhibit 1
Exhibit 2
A network uses RSTP, as shown in the exhibits. The network administrator wants switches to use the link that connects to Core-2 to forward some of the traffic. The administrator enters these commands on every switch shown in the exhibit:
The administrator then discovers that the links to Core-2 still did not forward any traffic.
What should the administrator do to enable these links to carry traffic?
A. Change the spanning tree mode to MSTP on all switches.
B. Activate the MSTP region configuration on all switches.
C. Lower the port cost on the links that connect to Core-2 on the access layer switches.
D. Configure Core-2 with spanning tree priority 0 in instance 2.
Answer: C
NEW QUESTION: 4
Which configuration will create a trigger for Cisco Unity Express so that when Cisco Unified Communications Manager Express callers dial extension 4001, they are connected with voice mail?
A. ccn trigger sip phonenumber 4001 application "voicemail" max sessions 2 end trigger
B. ccn trigger sip phonenumber 4001 application "voicemail" enabled max sessions end trigger
C. ccn trigger jtapi phonenumber 4001 application autoattendant enabled max sessions 6 end trigger
D. ccn trigger jtapi phonenumber 4001 application voicemail max sessions 6 end trigger
Answer: B